I have to agree for a daily use holster. I remember as a kid on the ranch, it's easy for your feet to go out from under you just walking downhill on a cow trail. Sat down hard more than a few times. An open toe is an invitation for mud or a stick to get jammed in there.
I do not like open toe holsters at all! I have and will make them at a customer's request, so long as the end of the holster extends at least 1/2" beyond the muzzle of the seated gun. I will NOT make an open-end holster for use in the field, such as my #96x series of hunting holsters, however! When you have slid down as many mountains or sat down in a snow drift, you do not want the possibility of getting dirt, mud or snow in the muzzle! When I make an open-end holster, solely at a customer's request, I make sure they understand that I do not assume any liability for muzzles plugged up with dirt, mud or snow!
Plugged ends are more time-consuming to do, hence, slightly more costly, but are certainly appropriate for many styles of holsters, including military. The sewn-round ends are appropriate for a particular style. The holster then needs to be wet-formed so the muzzle can extend properly to the end of the holster body.